Caitlyn Jenner revealed all in her new memoir, “The Secrets of My Life.”

Caitlyn Jenner's new memoir "The Secrets of My Life" hit shelves Tuesday, and the former Olympian and reality star, 67, holds nothing back in the highly anticipated book.

From the early days as a high school Bruce, to her tumultuous relationship with "Keeping Up with the Kardashians" matriarch Kris Jenner, Caitlyn's memoir is chock full of fascinating tidbits that reveal what life was really like for the star.

Here are five of the juiciest revelations from "The Secrets of My Life."

1. Jenner secretly had estrogen shots in the '80s, and was almost found out by Nicollette Sheridan

In the late '80s, Jenner began hormone therapy in order to allow the "woman inside me…to blossom." The therapy led to a full set of breasts, which she attempted to hide by binding them tight under baggy shirts. "Desperate Housewives" actress Nicollette Sheridan nearly found out Jenner's secret while the two were guest starring on Dick Van Patten's "Dirty Tennis," shouting, "Oh my god! What are those?! They're bigger than mine!" after feeling Jenner's chest. Jenner stopped hormone therapy in the '90s, and had the breasts surgically removed following the births of her daughters, Kendall and Kylie.

2. She would go for drives dressed in a wig and women's clothes

Intermittently between years of self-imposed isolation at home, Jenner would take advantage of Halloween and use it as an excuse to try out dressing like a woman in public. On one occasion, while driving a Mustang down the Pacific Coast Highway, Jenner witnessed a car crash and was nearly caught up in the damage. Jenner avoided involvement, which she writes would have caused the cops to spread the story. Following the incident, Jenner began carrying around a letter in her car saying she was gender dysphoric.

The book was published on Tuesday.

(AP)

3. Kris Jenner knew about her gender struggles from the very beginning

Despite Kris Jenner's vehement denials, Caitlyn writes that she was up front with her ex about her gender dysphoria from the very beginning. She claims that she told her "there had been a woman inside me all my life," and that she often dressed as a woman, a habit Kris occasionally witnessed. Jenner also writes that she was never entirely comfortable having sex with Kris.

4. Kim Kardashian saved items of Bruce's clothing

Following her 2015 transition into Caitlyn, stepdaughter Kim kept some of Bruce's old clothing "as a way to remember who (Caitlyn) once was, almost as if there (had) been a death in the family."

5. The Kardashian crew was upset they were not interviewed for Caitlyn's Diane Sawyer interview

When Caitlyn held her big interview with Diane Sawyer in 2015, her stepchildren were not included, a choice Jenner writes left them feeling "slighted." "They were slighted on purpose because of research showing that anytime a Kardashian is on television, many in the public tend to think it is a publicity stunt to make money," she writes, stressing how important it was for people to take her and the interview seriously.